The main theme is likely peace. Since it's about the Prince of Peace, it will probably focus on how peace is brought into the world through the Christmas story.
It's likely a story centered around the concept of the Prince of Peace, which is often associated with Jesus in the context of Christmas. It might tell about the significance of his birth and how it brings peace to the world.
One Christmas peace story is about a small village during World War I. On Christmas Eve, the soldiers from both sides of the front lines spontaneously put down their weapons. They started to sing Christmas carols. The Germans in their trenches and the Allied forces in theirs joined in this impromptu celebration. They even came out into the no - man's - land in between, shared food and cigarettes, and played football together. For a brief moment, the horror of war was forgotten, and there was peace, all in the spirit of Christmas.
Perhaps Gray could take on the role in an alternate storyline. Gray has always had a sense of justice, and his cool - headed nature could be developed into that of a 'Prince of Peace'. He could learn a new form of ice magic that has the ability to freeze aggression and hatred, thus bringing peace to the areas affected by conflict. For example, when dark guilds start causing trouble, Gray uses his new powers to stop them without having to fight in a violent way.
In the Christmas story, 'peace' refers to the state of calm and harmony that Jesus' birth was supposed to bring. It's about the end of hostilities and the beginning of a new era of hope and love.
Love is a key element. In most Christmas peace stories, it's the love that makes people overcome differences, like the soldiers in the trenches during World War I loving the idea of Christmas so much that they forgot about the war for a while. Another element is kindness. When someone shows kindness, it can break down barriers. For example, in the story of the feuding families, the boy's kindness to the lost girl started the peace process. Also, the spirit of giving is important. People give up their grudges or resources to create peace, just as the community did to save the center.